PREFACE
In the ACs conference held in July, 2010 at KVS (HQ), New Delhi,
issue of Study Material for Board classes was discussed at length
and finally decided to provide it to students. Various Regional
Offices were asked to prepare the study material in different
subjects while the task of its correction and moderation was
assigned to various ZIETs of KVS.
KVS, ZIET, Chandigarh received study material in the subjects of
Physics, Chemistry, and Biology &Maths for XII, Maths and
Science &Tech. for X class, from various Regional Offices. The
study material was got reviewed and suitably modified by organising
workshops of experienced and competent subject teachers with the
co-operation and guidance of AC,KVS,RO,CHD. Corrected study
material was sent to all regional offices for providing it to
students and also uploaded on the Website
WWW.zietchandigarh.org.
Subject teachers, both at the preparation and moderation levels
have done a remarkable job by preparing a comprehensive study
material of multiple utility .It has been carefully designed and
prepared so as to promote better learning and encourage creativity
in students through their increased self efforts for solving
assignments of different difficulty level. But the teachers and the
students must bear in mind that the purpose of the study material
is in no way to replace the text-book, but to make it a complete
set by supplementing it with this study material so that it may
provide requisite and adequate material for use in different
ways.
The study material can be effectively used in the following
ways:
Practice material to supplement questions given in the
textbook.
Material for Study Camps: The purpose of conducting study camps
is to inculcate study habits amongst
students under active supervision of the teachers. These camps
can beorganised within the normal school hours and days. Day wise
target will be ascertained and given to the students and reviewed
by the concerned subject teacher. If the target is not achieved by
any student, it will be added to the next days target.
Master Cards: The teachers can help students prepare master
cards by taking the important
questions/topics/points/concepts /reactions/terms etc from this
study material for the quick revision for the examination.
Crash Revision Courses: The material can also be used for
preparing handouts for conducting Crash Revision Courses under the
supervised guidance of the teachers just before or in the gaps
between papers during examination.
Effectiveness of the study material will ultimately depend upon
its regular and judicious use for the above listed purposes both by
teachers and students. While attempting the source material, it
would be quite useful to mark every time a question done
successfully with a tick out ( ) and a question not done
successfully with a dot ( ). It can be later used as a source of
feedback for error analysis and for effective subsequent
revisions/remedial work etc. I am sure that this well prepared
study material if used sincerely and judiciously will surely bring
cheers to all sections of students.
I, also, take this opportunity to extend my most sincere
gratitude to our Honble, Commissioner KVS (HQ), New Delhi, and
other higher authorities of KVS for providing this opportunity for
making some useful contribution to the study material.
I also extend my thanks to all the Assistant Commissioners of
various Regions for their in-valuable contribution in preparation
of the Study Material in various subjects.
Above all, sincere and dedicated efforts of the subject teachers
in preparation of this study material deserve full appreciation.
Teachers observations, suggestions and critical analysis for
further improvement of the study material mailed to kvszietchd
@gmail.com, will be highly appreciated.
With best wishes to all users of this STUDY MATERIAL.
(HAR GOPAL) Director KVS ZIET Chd
.
UNIT 1 ELECTROSTATICSConceptsCharge conservation Coulombs law
Superposition Principle Continuous charge distribution Electric
field due to a point charge Electric field lines Electric Field due
to an electric dipole Electric dipole in uniform electric field
Electric flux Gauss Theorem Electric field due to long straight
wire, charged infinite plane sheet and charged shell using Gauss
Theorem Electric potential due to point charge Electric potential
due to an electric dipole Equipotential surface Electric potential
energy of system of two charges Electric potential energy of an
electric dipole in external electric field Properties of conductors
Principle of capacitor Capacitance of parallel plate capacitor
Capacitance of parallel plate capacitor with Dielectric Combination
of capacitors Energy stored in a capacitor Van De Graff
Generator
Degree of importance* *** ** *
Reference from NCERTP-8 P-10 Ex1.4 P-13 P-15 Ex1.6 P-16 P-32
Levels of AssignmentL-1 L-2, L-3 L-1,L-3 L-1
Errors generally committed-ve and +ve sign to be taken care of.
Wrong formula and wrong reasoning Application of concept not clear
for numerical problems Wrong conceptualization of discrete charge
and continuous charge
*** *** ***** **** ** *** *****
P-18 Ex1.8 P-21 P-23-24 P-27-28 Ex1.10 P-29 P-31 P-25-26 P-33-34
Ex1.11P-35 P-37-39 Ex1.12 P-36
L-1, L-2, L-1, L-2, L-3 L-2,L-3 L-2, L-3 L-1, L-2 L-2, L-3 L-2,
Conceptualization problem Problem in understanding Gaussian surface
concept Concept of charge density(linear and surface), relation of
R and r in case of shell Application of the concept, reasoning
questions Equipotential surface Wrong reasoning
***
**** **** *** ****
P-53-54 Ex2.2 P-58, Ex2.3 P59 P-55-56 P-60 P-65 Ex2.6 P-67
P-66
L-2, L-2
L-2, L-3 L-1, L-2, L-3 L-3 L-2, L-3
Stable and unstable equilibrium
** * *** ***
P-68-69 P-73 P-74 P-75 Ex2.8 P-77 P-78-79 Ex2.9 P-79 P-80-81
P-83-84
L-1, L-3 L-1 L-1, L-2,L-3 L-3
Explanation of concept
Concept of polarization and electrical susceptibility
Application of concept for numerical Finding loss of energy
*** **** **
L-3 L-2, L-3 L-2, L-3
Unit I
ElectrostatisticsLEVEL 11. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12.
13. State the principle of quantization of electrical charges. What
do you mean by relative permittivity? Write its relation in terms
of force & electric field. Write its dimensions. Define
electric field intensity. Write its expression due to a point
charge and find its dimension. Draw electric field lines of an
electric dipole. Write three properties of Electric field lines.
Define electric dipole moment. What is its unit in SI system?
Derive an expression for the torque acting on an electric dipole
placed in a uniform electric field and hence find its potential
energy. What do you mean by electric potential? Derive an
expression for it due to a point charge. Explain three properties
of equipotential surfaces. Define electric flux. How is it related
to the charge enclosed? State Gausss theorem and using it derive
the expression for electric field due to a uniformly charged
spherical shell Write the principle of a capacitor & derive
expression for energy stored in a capacitor. Explain the principal
and construction of Van de Graff generator with the help of
diagram.
LEVEL 21. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Write two
limitations of Coulombs law. What are the unit and dimensions of
permittivity of free space? Calculate the electrostatic force
between two - particles at a distance of 2x10 -5 m between them.
Why do electric field lines never cross each other? Derive an
expression for the electric field at a point on the equatorial line
of an electric dipole. Does an electric dipole always experience a
torque, when placed in uniform electric field? Support your answer
with reason. How an electrostatic potential is related to the
electric field at a point? No work is done in moving a test charge
over an equipotential surface. Why? Derive an expression for the
potential energy of an electric dipole in an external uniform
electric field. What is meant by electrostatic shielding? Derive an
expression for the capacitance of a parallel plate capacitor? On
what factors does the capacitance of a parallel plate capacitor
depend? Define dielectric constant in terms of the capacitance of a
capacitor.
13.
14.
In a parallel plate capacitor, how is the capacity affected,
when without changing the charge. a. The distance between the
plates is doubled. b. Area of the plates is halved. Derive an
expression for the energy stored in a parallel plate capacitor with
air as the core material of the capacitor.
LEVEL 31. Two point charges of charge values Q and q are placed
at a distance of x and x/2 respectively from a third charge of
charge value 4q, all charges being in the same straight line.
Calculate the magnitude and nature of charge Q, such that the net
force experienced by the charge q is zero. The variation of
electric fields of two systems with distance from each is shown in
the graph. Identify nature of each system of charge.
2.
E 1 2
r
3.
4.
5. 6.
Draw Electric field lines for I. Charge q>0 II. q
